A sand dam is a reinforced concrete wall built across river beds. A pipe is built into the dam, going 20 meters upstream, and the dam is 2 to 4 meters high and up to 90 meters across. Over one to three seasons the dam fills up with water and then also with sand, which is able to filter water through the pipe built directly into the dam. Because of the sand, sand dams are able to hold large amounts of water.
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